Scraper attachment



N. J. PRITCHARD SCRAPER ATTACHMENT Fi'led Jan, 18. 1923 2 sheets sheet 1 March 25 1924. 1,488,059

' N. J. PRITCHARD SCRAPER ATTACHMENT Filed Jan. 18. 1923 2 Sheets-Sheet 2 4 raw/s43 drawn Patented Mar. 25, 1924.

U D STA S PATENT OFFICE.

na'rnammionnson'rnrrcnnsn, or sama ROSA, CALIFORNIA, Assmnoa or our.-

rouarn r tacos 'rnonasmannoar AND ONE-FOURTH r0 JOHN xmnsan MAL y Long orn or mm Rosa, cnmroanm.

SCRAPEB AT'IJAGHIMENI..

Application filed January 18,1923. Serial No. 618,461.

To all whom it may concern Be it known that I, NATHAN EL JOHNSON PRITCHARD, a: citizen'of the United States, and a residentof Santa Rosa, county of So- 5 home, State-of California, have invented a new and useful Scraper-Attachment, of which the following is a specification.

The prcsentinvention relates to improvements in scrapers such as are commonly, used for the levelling of agricultural land, the throwing up; of dams, excavating of ditches and the like; -Aiscraper articularlyadapted for this purpose is t e well known Fresno scraper comprising a scoop bucket with a vertical handle secured to its rear end andshoes associated with the front end on which the scraper ridesduring the dam ing operation '--The Fresno scraper whic was primarily designed as a horselement requires for its operation a man e ind the scraper who starts the dumping operation-by 'a slight lift on the handle and returnsthe scraper to aninitial positio ":by pulling the handle rearward. Such a scraper, if-drawn by a tractor would require: the presence of two operators, one to' drive' the tractor and oneman'walking behind the scraper to operate the same. My attachment for the scraper is desi edto allow. the scraper 'tobe handled y the driver of the tractor who 'rides in front of the scraper. and the (principal object of the invention is to provi ea hinge arrangement allowing of such handling of the scraper. -The preferred formF- of the invention is illustrated in. the accompanying drawin in which Figure 'Ll shows the scraper wit myzattachment in side-elevation in its normalstravellingposition, Fi re 2- the same scraper slightly tilted 'rea y to pick up a load; Figure 3 the same scraper near the end of the dumping operation, Figure 4 an enlarged detail view, in side elevation, of a lever mechanism and Figure 5 a top plan 46 view-of said mechanism. While I have shown only the preferred form of the inmention I wish tohave it understood that various changes ormodifications may be made withinthe scope of the claims hereto attached without departing from the spirit of the invention. It should be especially understood that my attachment is not confined to the use in connection with the Fresno scraper but may be used on any other scraper working on similar principles;

The scraper (1) is shown as comprising a scoop bucket (2) consistin of a bottom member (3) having a sharp ront edge (4) and connecting, through a curve (6) with a vertical rear member (7), from which rises a rather long handle (8) provided with a rope (9). Two side members (10) complete the bucket. A pair of arallel shoes extend forwardly from the si e members to turn upwardly at a distance of a few inches from the side members, and rearwardly, as shown at 11, after having risen to a height slightly exceeding that of the bucket. The rear ends of the shoes are bolted or riveted to the upper rear ends of the side members. The devicethus far described is the'well known Fresno scraper and no novel fea tures areclaimed for the same.

My novel attachment consists primarily of a draw bar (12) comprising preferably 75 two parallel members (13 and (14) ivotally; engaging the ban 1e (8) slig tly above t e scoop bucket by means of slots (16) riding on a pin (17). The front end of this draw bar is connected to the tractor, not shown in the drawing, by means of a bar (18). A forked draw bar (19) of considerably shorter length than the main draw bar is pivoted to the sides near the normal center of avity of the loaded bucket, as shown at 21) and extendsforwardly so as to straddle the main draw bar well infront of the sore er. The two bars are ivotally connected y means of a hinge {22), the rear end of which is pivoted to the main draw bar as shown at (23) while the front end is pivoted to the forked draw bar as shown at (24). Several holes (26) are'provided to receive the pivot to allow the. engagement to be adjusted to scrapers of different sizes and designs.

A normal forward pull on the main draw bar will normally make itself felt: through the connecting hinge on the forked draw bar so that the latter substantiall assumes the load. For the dumping of t e load it is necessary that the load be transferred below and rearwardly of the -,its most forward position.

ment may draw bar (12) rearward vide the lever handle (27 which is pivoted to the-.main draw bar at a point ightly his lever extends forwardly a short distance and then turns upwardly so that its upper end is within convenient reach of the driver. When the latter pushes the lever backward .it will raise the pivot (24:) and thereby the front end of the forked draw bar (19) until the pivot has passed an imaginary line connecting the pivot (23) with the pivot (21). The pivot (24) will then automatieally continue its travel around the pivot (23) due to. the rearward pull exerted by the scoop bucket and allow the whole load to be assumed by the draw bar which as a result causes the rear end of the bucket to tilt forward and to dump1 the load.

. To operate the scraper t driver first pulls on' the rope (9) thereby tilting the scraper forward from the position shown in Figure 1 to that of Figure 2. This movebe effected without disturbing the hinge arrangement and only causes the in (17) to ride forward in the slot (16). he front edge of the scraper now, on a forward motion of the tractor, scrapes the loose dirt into the bucket until the same is filled. The driver then pushes back on the lever. handle (27) thereby swin ing the pivot (M) upwardly to pass the ins connecting the pivots (21) and (23) whereupon the draw bar which now assumes the load commences to tilt the bucket forward and to dump the same in the manner described.

After the load is dumped the driver backs his tractor, thereby pushing the main which causes the scoop bucketto fall bac into its original position. During the execution of this movement the pivot (17) which during the dumping operation, as shown in Figure 3, had assed the pivot (21) is thrown rearward y of the latter pivot, or, to state it in opposite terms, the pivot (21) is thrown forward relative to the pivot (17). This forward thrust of the pivot (21) is communicated to the forked bar (19) which swings the hinge (22) forward on the pivot (23) and causes the pivot (24) to return to its original position shown in Figure 1.

I claim:

1. A scraper comprising a scoop bucket having a bottom member, an end member and, two side members, a draw bar pivotally associated with the end member above the normal line of draft, a second bar engaging the side members, a pivoted hinge ivot (24) in normally disposedlinithe line of draft'soas'tdcause the two bars to cooperate in pulling the load and means al.- lowing the position" of the hinge to [be changed wherebythe whole load is trans; ferred to the drawbar,

3. A scraper comprising asceop bucket having a bottom member, jan end'me'mber and two side members, a drawlbar jaigotally associated with the end member v'e'the normal line of draft, a second bar engaging the side members, a pivoted hin connecting the bars normally dis ose in'the line of draft so as to cause t e two bars to cooperate in ulling the load, and means for throwin t e 'frontend of th'e'hinge upwardly w ereby the whole load is trans ferred to the drawbar.

4. A core r adapt'ed'to be 0 rated by an operator ri ing infront oft e same com prising a. scoo bucket having a bottom member, an on member and two side'memhere, a draw bar the end member a ve the normal line of draft, a second barengaging disposed to norma cooperate in pulling".

' osed within reach of the operator allow ing the positio'n' of'the hingeito be changed whereby. the whole ld d'i tmhsfeyiiem th drawbar.

. 5. A scrageradal ed 'be oper t d m bers, a draw bar-pg'otally, associated with I vs the normal line of the end member a draft, a second Ib'ar'engagin'g the side mein hers, a pivoted hingel 'connectifn the bars re, i Pu n to cause the two'bars to the load and a leverpivote adapted to throw the front end of the hinge upward when pushed backward by the op erator whereby the whole loadistransferred to the .draw bar.

6. A scrapercompr sing ascoop bucket,a

draw bar pivotally engaging the same above and rearwardly .of its center of gravity,;a second bar pivotally, engaging the b'uclr'et the side-"meme 1 here, a pivoted hi'n" connecting the two bars 1y cause the two-bars to the load'and' means dis- "ivot'ally associated with to the drawjbar near its center of gravity, a pivoted hinge connecting the two bars disposed to nor mally cause them to cooperate in pulling the load and means allowing the position of the hinge to be changed whereby the whole load operator ri ing in front of the same, comprising a scoop bucket, a draw bar pivotally engaging the same above and rearwardly of its center of avity, a second bar pivotally the ucket near its center of gravity, a pivoted hinge connecting the bars nor- ,its center of mally disposed in the line of draftso as to cause the two bars to cooperate in pulling the load, and means disposed within the reach of the operator allowing the position of the hinge to be changed whereby the whole load is transferred to the draw bar.

9. A scra er adapted to be operated by an operator ri ing in front of the same, comprising a scoop bucket, a draw bar pivotally engaging the same above and rearwardly of gravity, a second bar pivotally engaging the ucket near its center of gravity, a pivoted hinge connecting the bars normally disposed in the line of draft so as to cause the two bars to cooperate in pulling the load, and a lever pivoted to the draw bar adapted to throw the front end of the hinge upward when pushed backward by the operator whereby the whole load is transferred to the draw bar.

NATHANIEL JOHNSON PRITCHARD. 

